exam Exam Numerical Ability

Two men,Vikas and Vishal,working separately can mow a field in 8 and 12hours respectively.If they have work in stretches of one hour respectively,Vikas beginning at 8a.m,when will the mowing be finished?

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exam Other Question
A and B can finish a work in 12 days B and C can finish the same work in 20 days .If A,B and C working together for 4 days and after that C left the work .Now how many days A and B will take to finish the work. A Garrison of 3300 men had provision for 32days,when given at the rate of 850gm per head.At the end of 7days,a reinforcement arrived and it was found that the provision would last 17 days more,when given at the rate of 825 gm per head.What was the strength of the reinforcement?